/Engine/Source/Editor/Kismet/Public/Debugging/SKismetDebugTreeView.h
Returns current value of Search String
[FText](API\Runtime\Core\Internationalization\FText) GetHighlightText ( const [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FString](API\Runtime\Core\Containers\FString) > InSearchString ) const